This could be any number of issues. Here are a few possibilities,
however, to resolve the issue, a better problem description is necessary.
Possibilities:
1 Your /etc/fstab file is incorrect in some way.
2 Your filesystem is not ext3
3 The drives are no longer available (check for the drives in CMOS)
If you can get any more information, it would be incredibly helpful in
resolving the issue.
Regards,